Note that the "all or in part" numbers are for viewers that watched even a small part of the show (could be as little as a minute), and are not comparable to the average viewership numbers included in the vast majority of the posts on our site.

via press release:

MOST VIEWERS IN NINE YEARS WATCH CBS SPORTS' WEEKEND COVERAGE OF MASTERS(R) AS ESTIMATED 46.5 MILLION VIEW ALL-OR-PART OF THIRD AND FINAL ROUNDS -- FINAL ROUND VIEWED IN ALL-OR-PART BY 39.2 MILLION, UP 11%

An estimated 46.5 million viewers (Persons 2+) watched all-or-part of CBS Sports' weekend coverage of the 2010 Masters® according to Nielsen Media Research. The Network's coverage of the third and final rounds of this year's Masters on Sunday, April 11 and Saturday, April 10 was the most watched in nine years when 47.9 million watched all-or-part of Tiger Woods winning his second Green Jacket in 2001. This year's 46.5 million was up 11% from last year's 42.0 million.

Nielsen Media Research estimates CBS Sports' final-round coverage on Sunday, in which Phil Mickelsonwon his third Green Jacket, was seen in all-or-part by 39.2 million viewers, up 11% from last year's 35.2 million, which saw Angel Cabrera win in a two-hole playoff over Kenny Perry and Chad Campbell for the 2009 title. This year's 39.2 million viewers was the largest number of viewers to watch all-or-part of CBS Sports' final-round coverage of the Masters since 40.1 million watched Woods win his second Green Jacket in 2001.

CBS Sports' coverage of Sunday's final round earned an average preliminary national household rating/share of 10.7/24, up 29% from last year's 8.3/20. Final-round coverage peaked with a rating/share of 13.2/27, with an average audience of 21.3 million viewers from 6:30-7:00 PM, ET, as Mickelson and Woods finished up their respective rounds.